/* ------------------------------
  ヘッダー
--------------------------------- */
header {
  position: sticky;
  top: 0;
  background-color: rgba(255, 255, 255, 0.7);
}

.header {
  max-width: 1280px;
  margin: 0 auto;
}

.header-inner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 15px 5px 0px;      /* 上・右・下・左 */
}

.header-logo {
  display: block;
  width: 350px;
  padding: 0 15px 0 0;
}

.nav-wrapper {
  display: flex;
}

.nav-ul {
  display: flex;
  margin-bottom: 0;
  gap: 25px;
}

.nav-ul li {
  font-size: 16px;
}

.nav-item {
  display: flex;
  a {
    color: inherit;
    text-decoration: none;
  }
}

.nav-link {
  color: inherit;
  text-decoration: none;
  text-decoration-color: var(--color-key);
  text-underline-offset: 0.28em;
}

.nav-link.is-current {
  color: var(--color-key);
}

.nav-link:hover,
.nav-link:focus-visible {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--color-key);
}

/* ------------------------------
  ヘッダー下共通（タイトルエリア）
--------------------------------- */
.title-bar-inner {
  background-color: var(--color-bg-key);
  padding: 80px 50px 100px 50px;      /* 上・右・下・左 */
}

.title-bar-main {
  text-align: center;
}

.page-title {
  font-size: 84px;
  letter-spacing: 0.4rem;
}

.page-title-explanation {
  margin-top: 25px;
}

.display-menu-pc {
  display: flex;
}

.display-menu-sp {
  display: none;
}

/* ------------------------------
  モバイル
--------------------------------- */
@media screen and (max-width: 899px) {

  .display-menu-pc {
    display: none;
  }

  .display-menu-sp {
    display: flex;
  }

  .menu-button-sp {
    padding: 5px 5px 0 5px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 32px;
    height: 32px;
    border: 0;
    cursor: pointer;
  }

  .menu-chevron-down {
    color: var(--color-key);
    display: inline-block;
    vertical-align: middle;
    line-height: 1;
    width: 1em;
    height: 1em;
    border: 6px solid currentColor;
    border-left: 0;
    border-bottom: 0;
    transform: translateY(-25%) rotate(135deg);
  }

  .menu-aria-sp {
    position: fixed;
    top: 0;
    left: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 81, 158, 0.9);
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
    transition: all 1s ease;
    transition-property: opacity, pointer-events, visibility;
    &.is-show {
      opacity: 1;
      pointer-events: auto;
      visibility: visible;
    }
  }

  .menu-content-sp {
    width: 100%;
    max-width: 97%;
    padding: 8px 12px 8px 12px;      /* 上・右・下・左 */
    background: var(--color-bg-base);
    text-align: center;
  }

  .nav-ul-sp {
    margin: 0;
    padding: 0;
  }

  .nav-item-sp {
    border-bottom: solid 1px var(--color-key);
    a {
      display: block;
      padding: 16px 0 16px 0;
      color: inherit;
      text-decoration: none;
    }
  }

  .nav-item-sp .nav-link.is-current {
    color: var(--color-key);
    background: rgba(0, 81, 158, 0.08);
  }

  .menu-close-sp {
    padding: 16px 0 16px 0;
    cursor: pointer;
    font-size: 16px;
  }

  .title-bar-inner {
    padding: 80px 0.1rem 100px 0.1rem;      /* 上・右・下・左 */
  }

  .page-title {
    font-size: 52px;
  }

  .page-title-explanation {
    padding: 0 1.5rem 0 1.5rem;      /* 上・右・下・左 */
    text-align: left;
  }

}